Americans have come to fear men more than G-d so they turn to men to solve their problems. Some turn to Obama, others to Clinton, some to Sanders or Trump, and yet others to Cruz. As much as I support Cruz, he is not going to save this country from the significant minority that wish to make it a Baal worshipping state or a godless nation ruled by elitists.
Besides Jonah, there are also prophecies that were fulfilled with terrible consequences. The Assyrian and Babylonian captivities are in the Bible as well. While there may be no specific prophetic reference in the Bible to America, is it not possible that G-od looks on us and says "how many times must I warn you? How many examples must I show you? You know what is coming yet you persist in your evil ways."